[pjr12345]

Why don’t they just start measuring skulls like the Nazis used to???

[redgolum]

??

By using the common genetic trait, there is at least a good idea that they came from the same people somewhere along the line. It is uncommon enough that it is fairly specific.

[Quix]

Perhaps you would learn a lot from the National Geographic’s DNA project. You can search out your own ancient ancestoral path across the planet. It’s available at their website.